Frederick william bhesam



(No Model.)

P. W. EHRSAM.

. ROTARY PAN,

N0.35"7,91,2. Patented Feb. 15, 1887.

FIC]

WITNESSES; INVENTOR 47%; M a lwz WM N. PETERS, FhbXo-Lilhugmpher,Washingon. D411- UNITED STATES PATENT OFFICE.

ROTARY FAN.

SPECIFICATION forming part of Letters Patent No. 357,912, dated February15,1887.

Application filed Oetoher 21, 1885. Serial No. 180,470. (No model.)

IO used in offices, restaurants, &c., and which are preferably madeloose on the driving-shaft, so that each can be put in motion or stoppedindependently of the motive power and the object of my improvement is toeffect this engaging and disengaging in a simple and efficient manner,as fully shown and illustrated in the accompanying drawings, in whichFigure 1 shows the entire apparatus as attached to the ceiling. Fig. 2shows an enlarged section of the disengaging apparatus out of gear, andin which the shaft revolves without thefan. Fig. 3 is a section similarto that of Fig. 2, but showing the position of the mechanism when thefan revolves with the shaft.

The same letters refer to the same parts in all the figures.

A in Fig. 1 is the bracket fastened to the ceiling, and having arms Band 0, through which the driving-shaft E passes.

D is the driving-pulley, secured to the shaft E with key, setscrew, orpin, its boss just fitting between the arms B and O, and thus keepingthe shaft in its position.

M F is the fan-sleeve, fitting loosely on the shaft E, and having twobosses, G and G, to receive the arms H and H of the fans, which aresecured in their places with set-screws.

J and J are collars pinned to the shaft E,

one above and one below the fan-sleeve F,

which is held in its place between them, but is free to revolve with theshaft or not, as the case may be.

The fan-sleeve F is provided with a vertical recess, K, upon its underside, and the collar J, with a vertical counterbored perforation, K thecounterbore being of the same size as the recess in the sleeve. A pin,P, is passed through the perforation, and has a head fitted in thecounterbore, which retains it in place, and the lower end is secured ina cup-shaped sleeve, Q, which fits around the collar J, and has itsupper portion preferably made flaring, as shown. By making the sleeve Qfit snugly around the collar the friction between the two will hold thesleeve, and with it the pin, in place, even if the motive power shouldstop. By this construction the locking mechanism is entirely out ofsight and the dust prevented from collectingin it, and the flaring mouthof the sleeve will act as a drip-cup for the oil shaft.

As the sleeve Q is constantly revolving with the shaft, and could not,therefore, be conveniently handled, it is provided with a loose wheel orball, S, which is free to revolve on the rod R. The manner in which themechanism is operated is now clear. The shaft E being constantly inrotation, the fans will revolve with it or not, according as the sleeveQ is in the position shown in Fig. 3 or that of Fig. 2. Suppose the fansnot to be in motion and it is desired to put them in gear. On layinghold of S and pushing it, and with it the sleeve Q, up, as soon as inthe course of a revolution the recess in the fan-sleeve" comes into aposition over the perforation in collar J the pin T will slip into therecess of the fansleeve and cause it to revolve with the collar and thedriving-shaft to which it is attached. The head of the pin 1? is madelong enough to fit into both the recess and counterbore of theperforation, and the collar J above the fan sleeve prevents the sleevefrom being slipped up the shaft when the pin is pushed up to lock thedevice ready for operation. To stop the fan it is only necessary to pulldown S, and with it the sleeve Q and the pin P, into the position shownin Fig. 2.

Having fully described my invention, what I desire to claim and secureby Letters Patent 1. In a rotary fan, the combination of a verticalshaft, a collar secured to the lower end of said shaft, having avertical counterbored perforation, a fan-hub loosely jonrnaled upon saidshaft, having a recess in its lower which is used to lubricate thefan-sleeve and side, a pin in the perforation of said collar, having ahead, said shafit, collar, hub, and pin being adapted to so engage andcoact with each other as to prevent the accumulation of dust within saidrecess or aperture.

2. In a rotary fan, the combination of a vertical shaft, a collarsecured to its lower end, having a vertical counterbored perforation, afan-hub Iooselyjournaled upon said shaft, having a recess in its lowerside, a pin in said perforation, having ahead upon its upper end, and aflaring cup-shaped sleeve secured to the lower end of said pin, saidsleeve engag ing with said collar and holding the pin in engagement withthe hub by means of frictional contact with the collar.

In testimony that I claim the foregoing as my own I have hereuntoaffixed my signature in presence of two witnesses.

FREDERICK WILLIAM EIIRSAllI.

Witnesses:

THOS. MOORE, OHR. PISOATOR.

